Urologic Surgery and Population Health Science, Duke Surgical Center for Outcomes Research, Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC. Electronic address: chuck.scales@duke.edu. Division of Urologic Surgery, Department of Surgery, Washington University School of Medicine, St Louis, MO. Department of Urology, University of Washington School of Medicine, Seattle, WA. Department of Internal Medicine and Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX. Renal-Electrolyte and Hypertension Division, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA. Department of Biostatistics, Epidemiology, and Informatics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Division of Pediatric Urology, Department of Surgery, The Children's Hospital of Philadelphia, Philadelphia, PA. Department of Biostatistics and Bioinformatics, Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD.